P0A7Fhigh severityPowertrain
Hybrid Battery Pack Deterioration
on 2009 Audi A8 4.2L V8 · AWD
What this code means
The hybrid control system detects that the high-voltage battery pack has deteriorated and lost significant capacity. This reduces fuel economy and hybrid performance.
Symptoms
- Reduced fuel economy
- Warning lights on dash
- Poor hybrid performance
Common causes
- Aged or degraded battery pack
- Failed battery cell or module
- Battery cooling system fault
- Faulty battery control module
Diagnostic steps
- Scan hybrid system codes
- Check individual battery block voltages
- Inspect battery cooling system
- Test battery capacity and state of health
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Other Powertrain codes on this vehicle
00532
Supply Voltage B+ Signal too Low
16394
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16395
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Mass or Volume Air Flow Circuit Low Input
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Mass or Volume Air Flow Circuit High Input
16500
Engine Coolant Temperature Circuit Malfunction
16501
Engine Coolant Temperature Circuit Low Input
16502
Engine Coolant Temperature Circuit High Input
16514
O2 Sensor Circuit Bank 1 Sensor 1
16515
O2 Sensor Circuit Low Voltage Bank 1 Sensor 1